condition mean min max ZT0-3 16.298182 16.298182 16.298182 ZT4-7 21.572020000000002 21.572020000000002 21.572020000000002 ZT8-11 36.663854 36.663854 36.663854 ZT12-15 28.8066635 28.8066635 28.8066635 ZT16-19 26.0930465 26.0930465 26.0930465 ZT20-23 23.32103 23.32103 23.32103